Pulp beater



PULP BEATER Original Filed June 25, 1926 gwuemo'o Leven zo M. 16v/e 'nsoll tboz nu? 5 V Patented Sept. 11, 1928..

UNITED STATES LORENZO M. AVENSON, OF ST. PAUL, MINNESOTA.

PULP BEATER.

Application led June 25, 1926, Serial No. 118,520. Renewed March 21, 1927.

My invention relates to improvements in pulp beaters articularly, though not eX- clusively, of tli ovular tub having a beater-roll therein for 5 beating the pulpand circulating it around the tu'b during the beating process.

' Anobject of the invention is to provide a plup beater` adapted\to receive from a pipe charges of raw fibrous material fed through l said pipe by gravity or by a current of air from ablower, or both, said beater including simple and effective means for confining to the tub all of the incoming fibrous material,

said means providing for the escape of air l forced into the structure with said material and, further, providing for washing the dust from said escaping air, the washing process,

in addition to its air cleansing action, assisting in providing for theescape of air from 20 the structure.

A more specific object ofthe invention resides in applying a hood over the channel of a beater in position next to the beater-roll, which hood has an entry conduit leading thereinto, also awall transversely of the .channel and vertically adjustable therein, the hood 'and its adjustable wall together with the beater-roll and the walls of the channel going to' form-a chamber for the reception of 80 material, the bottom of which chamber consists of that area of the'surfaceof the pulp mass beneath said hood.

l Another object of the invention is to supply a hood, as above, with a ventL therein 3,5 through which air may escape from said receivinochamber, a further object being to provi e a guard for this vent to prevent the escape of material from said chamber along with the air, a still further object being to `provide a spray, directed against said guard and into the chamber, for washingthe escaping air and beating back any material lodged against the guard and tending to block the passage of air through the vent.

Y With the foregoing and'other objects in view, which will appear in the following description, the invention resides in the novel combination and arrangement lof parts and inthe detailsof construction hereinafter deco scribed and claimed.

In the drawings, Fig. 1 is aipl'an view of a pulp beater illustrating an ,embodiment ofmy invention andFig. 2 is a section al view taken on the ine 2-2 of Fig. 1. j A

In instances where mw fibrous material is e type employing an openl material andv water, travels in this endless PATENT OFFICE.

fed to a pulp beater through a pipe by gravity, or by means of a current of air effected by a blower, or by both means and the material discharged directly into the open tub of the beater, great clouds of dust are created and scraps of fibrous material lare discharged from the beater into the open, rendering the working conditions within the building in' tolerable. This invention overcomes' this disadvantage by causing the fibrous material to be discharged into a receiving chamber, the bottom of which consists of a certain area of the surface of the pulp in the tub. Said chamber is formed with a vent allowing the escape of air therefrom, which airis washed by means of a water spray directed through the vent so4 that all of" the dust particles freely 4suspended a're caused to washed back into the tub. Aperforate guard traversing the vent arrests the escape of any of the larger pieces or particles of material introduced into said chamber and the spray I beats such particles back into the tub leaving said guard clear. Thus is permitted only the escape of clean fresh air 1nto the building. To avoid obstructing the pulp mass within the beater tub, the structure providing the receiving chamber for the fibrous material is equipped so that a wall thereof traversing the pulp channel in the tub may be elevated as the surface of the pulp rises and the lower edge of -said wall thereby maintained in brushing contact with said surface.

In ,the form of my invention illustrated, I have shown a tub 10 havi.ng two sidewalls 11 and 12, curved end walls 15 and 16 and a.

bottom 17 forming an ovular shaped recep' tacle o` en at `the top, 'except as hereinafter pointe out. Along the' center of the tu'b 10, longitudinall thereof, 'is .a .mid-feather 18 forming wit in the tub an endless ovular channel. The vpulp mass, comprising fibrous channel around the mid-feather `18. Between the mid-feather 18 and the wall 12 is mounty ed a shaft 19, which is journalled in bearings 20 and 21 secured to said mid-feather and wall, respectively. The shaft 19 is positioned at the upper portion of thejtub 10 and has mounted vupon it a beater-roll 22.' `This beater-roll is constructed with end plates 23 car- I rying between them a drum 24` To the drum 24 is attacheda number of {1y-bars 25 arf ranged longitudinally thereof, which -fly-bars serve to beat the pulp and cau'seitto` travel along the channel in the tub as indicated by arrows in Fig. 1. A base plate 26 co-oper ating with the fly-bars 25 assist in beating the pulp. As will be noted in Fig. 2, the upper portion of the beater-roll 22 extends above the level of the top of the tub 10. For guarding and protecting the beater-roll and enclosing the same, a cap 27 is used, which rests upon the wall 12 and the mid-feather 18 and conforms rather closely to the ath taken by the Working edges of the fiyars 25.

The invention proper includes a hood 28 positioned upon t ie tub 10 at one end thereof and occupying the space between the wall 16 and cap 27. -This hood is formed with a curved wall 29 conforming with and resting at its lower edge upon the upper edge of a portion of the curved wall 16 of the tub, and is formed with a transverse wall 30, the lower margin of which joins the adjacent end margin of the top of the cap 27 A longitudinally disposed wall 31 extends from the curved wall 29 to the transverse wall 30, said longitudinal wall being arranged in the plane of the mid-feather 18 over the channel in the tub 10 between said mid-feather and thewall 16. In addition to the walls 29, 30 and 31 is a top 32 completing the hood 28. Opening through the top 32 and into the -hood 28 is a pipe or.

conduit 33, leadino' from a hopper, blower or other source ofb fibrous material supply. Such material upon being discharged from said conduit 33, falls into the tub 10 immediately in advance of the point where it is acted' upon by the beater-roll 22. In this manner, the fibrous material becomes thoroughly mixed with the mass in the beater immedlately upon bein discharged into the same, so as to give sai fibrous material an opportunity'l to digest and to become treated for a maximum period of time. It will be noted that the wall 29, in effect, forms a continuation of the wall 16 of tub 10 and, as above described, the wall 30 joins the cap 27. Further, it will be observed that the beater-roll 22 occupies substantially the entire space between the cap 27 floor 17, wall 12 and mid-feather 18 and that the escape of air past the beater-roll is substantially precluded. Thus, to completiely enclose and, form a substantially tight chamber in the channel of the tub beneath the hood 27, it is only required to block the opening bounded at its sides by the wall 16 and the adjacent end of the mid-feather 18 and bounded at the top by the lower edge of wall'Bl and at the bottom by. the surface `of the pulp in the tub.

A closure or wall provided for this opening consists of aeurtain 35 mounted upon a roller 36. Said roller is frictionally journlled in bearings 37 and .38 secured to the walls 29 "and 30 of the hood 28, said roller extending along the lower edge of the wall 31 and being provided with a crank 39 by means of which the same may be rotated. In use, the curtain 35 is lowered upon turning the crank 39 until the lower edge of the curtain comes in contact with the surface 34 of the pulp mass within the beater. When so arranged a chamber, rendered substantially tight, is provided to receive the raw fibrous material, the bottom ofwhich chamber, as hereinbefore indicated, consists of the pulp mass with which the fed material commingles. As fibrous material is being added and the level of the mass within the beater rises, curtain 35 is wound up by turning the crank 39 to correspondingly elevate the lower ed e of said curtain and thereby maintain sai edge in wiping contact with the surface of the pulp.

In the conveyance of the fibrous material through the conduit 33 great volumes of air accompany the same and this air, entering the receiving chamber with said material, must be furnished with an avenue of escape from said chamber. To meet this condition, I have provided an upright vent tube 40 at the top 32 of the hood 28. Traversing the lower end of this tube 40 where it communicates through the top 32 with the receiving chamber beneath said hood 28 is a sc-reen 4l. All of the air escaping through. said vent 40 must hence pass through this screen. Immediately above the vent 40 is a downwardly directed spray nozzle 42 which is connected through a pipe 43 supplying water under. pressure. A spray of water is discharged from this nozzle through the screen 41 and into the beater. As air passes upwardly through the screen 41 and through the downwardly directed spray from the nozzle 42, all of the dust in the air is removed and the air leaves the beater and enters the building in a washed and clean condition. The action'of the spray upon the screen 41 causes any fibrous material which may be carried against the underside thereof to be beaten down from said screen into the pulp mass within the tub.

The invention is highly advantageous in that it provides a simple and effective means for confining the fibrous material to a beater, when such material is introduced thereto, and for cleansing the air at that time escaping from the beater. The water used for purifying the air is'discharged into the pulp mass, and is thereby used as a part of the water necessary for treating the same so that no waste occurs in the operation. The action of the spray against the screen 41 is such as to keep the same free of fibrous material and thereby maintain the passagewa through the vent at all times clear.

hanges in the specific form of my invention, as herein disclosed, may be Vmade withill) llil

in the scope of what is claimed without departing from the s irit of my invention.

Having describe my invention, what I claim as new and desire to protect by Letters Patent is:

1. A pulp beater comprising an open ovular tub for material to be treated, a midfeather longitudinally of the tub forming an endless channel therein, a. beater-roll positioned between said mid-feather and one of the Walls of the tub, a cap over the beaterroll, a hood covering the channel at the rcceiving side of said roll, a curtain hung from said hood in position transversely of the channel and spaced from said beater-roll, means for winding in and paying out said curtain to keep the lower edge thereof substantiallyA at the level of the pulp in said channel, a feed conduit opening through the hood into the receiving chamber formed in said channel beneath said hood and between said curtain and beater-roll, a vent pipe issuing fromsaid hood, 'a screen traversing said pipe, Iand a spray nozzle directed against said screen.

2. A pulp beater comprising an open ovular tub for material to be treated, a midfeather longitudinally of the tub forming an. endless channel therein, a beater-roll positioned between said mid-feather and one of the walls of the tub, a cap over the beaterroll, a hood covering the channel at the receiving side vof said roll, a wall associated with said hood in position transversely of the channel and spaced from said beater-roll, means for adjusting' said wall to keep the lower edge thereof substantially at the level of the pulp in said channel, a feed conduit A opening through the hood into the receiving chamber formed in saidchannel beneath said hood and between said curtain and beaterroll, said hood having a. vent opening therein, and a screen traversing said opening.

3. In a beater, a receptacle providing a channel for pulp, a beater-roll in said channel to beat the pulp therein and move the same therethrough, a cover having a vent therefor and arranged over a portion of said channel at the receiving side of the beaterroll, a wall depending from said cover transversely of said channel, said wellbeing adjustable vertically to provide for the disposition of the lower edge of said wall substantially at the level of the pulp in said channel, a feed conduit opening through said cover into the receiving ehamberfo'rined in said channel between said wall and beaterroll and beneath said cover, a perforate guard traversing said vent, and a spray nozzle directed against said guard.

4. In a beater, a receptacle providing a channel for pulp, a beater-roll in said channel to beat the pulp therein and move the same therethrough, a cover formed with a vent opening therein and arranged over a portion of said channel at the receiving side of the beater-roll, a wall depending from said cover transversely of said channel, said wall being adjustable vertically to provide for the disposition of the lower edge of said wall substantially at the level of the pulp in said channel, a feed conduit opening through said cover into the receiving chamber formed in said channel between said wall and beaterroll and beneath said cover, and a perforate guard for said vent opening.

5. In a beater, a receptacle providing a channel for pulp, a beater-roll in said chani nel to beat the pulp therein and move the same therethrough, a vented cover over a portion of said channel at the receiving side of the beater-roll, a wall depending from said cover transversely of said channel, said wall being adjustable vertically to provide for the disposition of the lower edge of said wall substantially at the level of the pulp in said channel, and a feed conduit opening through said cover into the receiving chamher formed in said channel between said wall `and heater-roll and beneath said cover.

6. A beater comprising a receptacle forming a channel forpulp, and a beater-roll in said channel to beat the pulp therein and move the same therethrough, combined with a structure forming a vented receiving chamber for fibrous material, the bottom of said chamber comprising a portion of the surface of the pulp, said structure embodying an element vertically adjustable to accord with changing levels of the pulp in said channel, whereby said structure may be kept closed at the bottom without interfering with the moving pulp.

7. In a beater, a receptacle providing a channel for pulp, a beater-roll in said channel to beat the pulp therein and move the same therethrough, a feed pipe for pulp stock opening into said channel, and meansl associated with the pipe, the receptacle and the pulp in the channel to confine the output of material from'said pipe to a part of said channel, said-means providing for non-interference with the rising pulp in the channel.

In testimony whereof, I have signed my name to this specification.

' LORENZO M. AVENSON. 

